// 防抖函数
export function debounce(fn, delay = 500){
    var timer;
    return function() {
      var args = arguments;
      if(timer) {
        clearTimeout(timer);
      }
      timer = setTimeout(() => {
        fn.apply(this, args);   // this 指向vue
      }, delay);
    };
}
/**
 * 处理富文本里的图片宽度自适应
 * 1.去掉img标签里的style、width、height属性
 * 2.修改所有style里的width属性为max-width:100%
 * 3.img标签添加style属性：max-width:100%;height:auto
 * 4.去掉<br/>标签
 * @param html
 * @return string
 */
export function formatRichText (html) {
// 去掉img标签里的style、width、height属性
  let newContent= html.replace(/<img[^>]*>/gi,function(match,capture){
    match = match.replace(/style="[^"]+"/gi, '').replace(/style='[^']+'/gi, '');
    match = match.replace(/width="[^"]+"/gi, '').replace(/width='[^']+'/gi, '');
    match = match.replace(/height="[^"]+"/gi, '').replace(/height='[^']+'/gi, '');
    return match;
  });
  // 修改所有style里的width属性为max-width:100%
  newContent = newContent.replace(/style="[^"]+"/gi,function(match,capture){
    match = match.replace(/width:[^;]+;/gi, 'max-width:100%;').replace(/width:[^;]+;/gi, 'max-width:100%;');
    return match;
  });
  // 去掉<br/>标签
  newContent = newContent.replace(/<br[^>]*\/>/gi, '');
  // img标签添加style属性：max-width:100%;height:auto
  newContent = newContent.replace(/\<img/gi, '<img style="max-width:100%;height:auto;display:block;margin:0px auto;"');
  return newContent;
}

